Drill



C. STO S DRILL 2 Shet 1 Filed May 10, 1920 Z w W w m a 5 .m ,5 5 E n h \D JOHN C. STOKES, 0F SHREVIEPORT, LOUISA.

DRILL.

Application filed May 10, 1920. Serial No. 380,371.

To all whom it may concern:

Be it known that I, JOHN C. STOKES, a citizen of the United States, residing at Shreveport, in the parish of Caddo and State of Louisiana, have invented certain new and useful Improvements in Drills, of which the following is a specification.

This invention relates to drills, and underreamers used in deep well boring, and is an improvement on my patented applications #1360328, and #1,379,4.-83, patented respectively November 30, 1920, and May 24, 1921, and the primary object of the present invention is to 'provide means for preventing mud, water and the like from passing up into the tool holder and by the bit blades and carrier.

Another object of the invention is the provision of an improved means for'associating the bit carrier with the tool holder, so that when the bit carrier is arranged in its lowermost position in the tool holder, :1 seal will be provided between the same, thereby effectively preventing the rising of mud and water between the tool holder and carrier.

A further object of the invention is the provision of an improved means for connecting the blades with the carrier so as to hold the blades in line, when the same are being pulled up out of the tool holder and drill stem.

A still further object of the invention is the provision of an improved means for constructing the'tool holder so as to permit the convenient replacing of the annular bit blade engaging shoulder when the same has become worn. a

Other objects and advantages of the invention will appear in the following detailed description, taken in connection with the drawings, forming a part of this specification, in which drawings:

Figure l is a fragmentary longitudinal section through the tool holder showing the carrier and bit blades in their lowermost positions, illustrating the connection between the carrier and. tool holder, when the car rier is in its lowermost position.

Figure 2 is a bottom plan view of the improved drill.

Figure 3 is a detail perspective view of one of the. drill blades.

Figure 4 is a fragmentary longitudinal section through the lower end of the tool holder, the blades and tool carrier being removed.

Figure 5 is alongitudinal section through the tool holder showing the means for washing the mud and other sediment from the lowerend thereof. i

Figure 6 is an enlarged fragmentary longitudinal section through the plug used for washing the lower end of the tool holder.

.Figure 7 is an enlarged longitudinal section through the tool holder showing a form thereof in which the bit blade engaging shoulder may be removed and replaced when worn, and

Figure 8 is a detail cross section taken on the line 8-8 of Figure 7.

Referring to the drawings, in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter A indicates the improved drill which includes the drill holder B, the bit carrier C and the bit D.

The tool holder B includes a cylindrical body 10 having an annular flange 11 formed on the inner surface thereof adjacent to its lower end, which forms. upper and lower shoulders 12 and 13 fer engagement with the bit D when the same is in its extended operative position.v The inner surface of the cylindrical hollow body 10 below the shoulder 13 is gradually increased in diameter toward its lower end as at 14 and this inclined portion is provided with one or more pairs of oppositely disposed lon 'tudinally extending ribs 5, which are a apted to form stops for the bit I). The inner faces of the longitudinally extending ribs 15 at one side face thereof are provided with right angularly disposed vertical walls, while the other face is disposed at an incline thereto. The upper ends of the ribs 15, are cut away or spaced from the lower shoulder 13 as at 16 which permits the shoulder 13 and the ribs 15 to be properly machined. The upper inner surface of the cylindrical body 10 above the annular shoulder 12 is enlarged in diameter as at 17, which forms a shouldder which is ground toform an inclined seat or bearing 18, the purpose of which will hereinafter more fully appear.

The bit carrier 0 comprises a solid body 19 which is substantially equal to the internal diameter of the enlarged portion 17 of the bore of the hollow cylindrical member 10 and the lower end of the same is bevelled to form an annular face 20 which is ada ted to fit on the seat or hearing 18 so as to onto a tight fit or seal between the tool holder lllltl B and the carrier C. This prevents the passing of water by the drill carrier when the same is in its lowermost position. The lower end of the body 19. is notched so asto receive the depending bit carrier legs 21, which are bolted as at 22 to the body 19, the nuts for retaining the bolts in place being countersunk in the legs 21. The legs 21 are provided with the channels 23 for permitting water to flow therethrough for washing the bit D. The drill carrier C directly below the inclined face 20 is reduced in diameter as at 24 and this face is grooved for the reception of a pair of packing rings 25, which are adapted to engage the inner face of the tool holder B between the annular shoulder 12 and the seator bearing 20 and forms an additional positive means for ,forming a tight contact between the tool carrier and holder for preventing the passage of mud and water therebetween. These rings 25 are of annular formation and can be made of rubber, leather or the like, or of metal and constructed similar to ordinary piston rings and when the rings are made of metal the same are split as at 26 to permit the positioning thereof onthe tool carrier and the expansion and contraction thereof. Thus it can be seen that an effective means is provided for preventing the flow of mud and water up around the drill carrier and between the same and the tool holder. The bit D includes a pair of spaced arms. or blades 27 and 28 which have their outer edges'provided with shoulders 29 and 30 for engaging the lower edge of the tool holder and the shoulder 13. The upper ends of the blades 27 and 28 are prov1ded with oppositely directed extensions which provide shoulders 31 which are adapted to engage the shoulder 12. when the blades are in their lowermost extended positions. The blades 27 and 28 are provided adjacent their inner edges with inclined slots 32 and the upper and lower endsof these slots terminate in angular straight extensions and 34. The slots 32 are adapted to receivethe pivot pin 35 carried by the terminals of the depend ing legs 21. The upper angular straight'extensions 34 are provided so as to permit the blades to be held in line and this angular extension extends parallel with the longitudinal medial line of the blade. There is a tendency for mud and other debris to collect in the slots 32 thereby preventing the bolt 35 from reaching the center of the blades. The provision of the extensions 34 permits the bolt to readily reach the center of the blades and permits the blades to be held in line. When it is desired to thoroughly wash the inner surface of the lower end of the tool carrier C the tool carrier with the bit D is raised and a plug E is substituted therefor. The plug E and tool carrier C are each provided with the conical head and stem 36 and 37, which is adapted to be engaged by the hoisting mechanism described and claimed in my pending application, Serial Number 371,608 filed April 6, 1920, patented May 24, 1921, PatentNo. 1,379,483. The plug E includes a cylindrical body 38, the upper end of which is provided'with an enlargement 39 which..p1ovides a shoulder 40 which is'adapted to seat on the shoulder 12. This limits the downinclined ports 43 which are arranged in annular formation around the cylindrical body and these ports form means for directing water on all points of the inner surface of the tool holder at the: lower endthereof.

. When the plug E has been placed in posi tion in the tool carrier B the well pumps are started at a high pressure which forces the water. through theports 42 into the interior.

chamber 41 and out of the ports 43 against the inner side of the tool holder.

It has been found that the lower shoulder 13 is subjected to severe wear and to overcome this. a form of the invention is illustrated in Figures 7 and 8 in which a removable and replaceable shoulder is provided.

In this form the tool holder B is made of an upper section 45 and a lower section 46 which are adapted to clamp in between the same the annular wear member 47 which takes the place of the annular shoulder 13. The lower terminal of the upper section 43 is provided witha reduced conical threaded extension 48 which is adapted to engage the internally threaded conical bore 49 formed on the upper portion of the lower section 46. The lower section 46 directly below the screw threaded extension 49 is provided with an annular groove 50 which is adapted to receive the annular wear member 47, which is preferably formed of hardened steel. When the sections 45 and 46 are threaded into engagement with each other, the lower end of the section 45 will engage the upper surface of the wear member 47 and force the same into tight engagement with the lower wall of the groove 50, and thus firmly hold the same in position. The sections 45 and 46 are threaded opposite to the direction of rotation of the tool holder to prevent the unthreading of the sections when the drill is in use. Thus it can be seen that when the wear member 47 becomes worn, the same can be quickly and easily renaemea placed by simply unthreading the section from engagement with each other.

Changes in details may be made without departing from the spirit or scope of my invention; but,

I claim:

1. In a drill apparatus, a tool holder, a bit carrier slidably associated therewith having a pair of annular grooves, resilient split rings mounted in saidgrooves and arranged to frictionally engage the inner surface of the tool holder so as to prevent the seeping of water, mud and the like between the tool holder and bit carrier.

2. In a drill apparatus, a tool holder, having an annular inclined seat formed on the inner surface thereof, a bit carrier slidably associated with the holder havzng an annular inclined shoulder formed thereon arranged to engage said seat, and resilient rings carried by the bit carrier and arranged to frictionall engage the inner surface of said toolhold iar.

3. In a drill apparatus, a tool holder, a bit carrier slidably assoc'ated therewith, an interior annular shoulder formed on said tool holder, an outer shoulder formed on said bit carrier arranged to engage said shoulder formed on the tool holder, and packing members carried by said bit carrier and arranged to frictionally engage the inner surface of the tool holder below said shoulders.

a. In a drill, a tool holder having upper.

' arranged to tit on said seat, a pair of bit blades slidably carried by said carrier including shoulders arranged to engage the lower edge of said holder and the upper and lower shoulders when the same are in their extended positions.

5. In a drill apparatus, a bit, carrier including a body, a pair of depending legs the lower end thereof, pairs of diametrically opposed longitudinally extending ribs formed on the inner surface of said holder below and in spaced relation to said annular shoulden.

7. In a drill apparatus, a tool holder including upper and lower detachable sections, and a wear ring clamped between said sections.

8. In a drill apparatus, a tool holder including upper and lower detachable sections, and a removable annular wear member detachabl held by said-sections. 9. In adril apparatus, a tool holder including upper and lower detachable sections, and an annular hardened wear member arranged to be detachably clamped between said sections. a I I 10. In a drill apparatus, a tool holder including upper and lower sections, the lower section having an annular groove, an outstanding annular wear member arranged to fit in said groove, a depending threaded extens on arranged to engage the lower section and to firmly hold said wear member in said groove.

11. In a drill apparatus, a drill holder, a

sliding bit carrier associated theith, bit

blades slidably and pivotally carried by said carrier, shoulders formed on said bit blades,

and an annular removable wear member car-- JQ e. 

